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- #include <cstdio>
- #include <stack>
- using namespace std;
- int N;
- stack<int> zero, uno;
- int funny() {
- if(!zero.empty() && !uno.empty()) {
- while(!zero.empty() && !uno.empty()) {
- int z = zero.top();
- int u = uno.top();
- if(z > u) uno.pop();
- else zero.pop();
- }
- return (zero.size() + uno.size());
- }
- return N;
- }
- int main() {
- freopen("input.txt", "r", stdin);
- freopen("output.txt", "w", stdout);
- scanf("%d", &N);
- for(int i = 0, direzione, dimensione; i < N; i++) {
- scanf("%d%d", &direzione, &dimensione);
- if(direzione == 0) zero.push(dimensione);
- else uno.push(dimensione);
- }
- printf("%d", funny());
- return 0;
- }
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